1671631387 has 2 divisors, whose sum is σ = 1671631388. Its totient is φ = 1671631386.

The previous prime is 1671631249. The next prime is 1671631391. The reversal of 1671631387 is 7831361761.

It is a strong prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-1671631387 is a prime.

It is not a weakly prime, because it can be changed into another prime (1671634387) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 835815693 + 835815694.

It is an arithmetic number, because the mean of its divisors is an integer number (835815694).

Almost surely, 2^1671631387 is an apocalyptic number.

1671631387 is a deficient number, since it is larger than the sum of its proper divisors (1).

1671631387 is an equidigital number, since it uses as much as digits as its factorization.

1671631387 is an evil number, because the sum of its binary digits is even.

The product of its digits is 127008, while the sum is 43.

The square root of 1671631387 is about 40885.5889892759. The cubic root of 1671631387 is about 1186.8071998362.

The spelling of 1671631387 in words is "one billion, six hundred seventy-one million, six hundred thirty-one thousand, three hundred eighty-seven".